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JJF 1184-2024: Testing Specification for Temperature Uniformity in Thermocouple Calibration Furnaces
Status: Valid JJF 1184: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJF 1184-2024 | English | 659 |
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Testing Specification for Temperature Uniformity in Thermocouple Calibration Furnaces
| Valid |
JJF 1184-2024
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| JJF 1184-2007 | English | 799 |
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Testing Specification of Temperature Uniformity in Thermocouple Calibration Furnaces
| Obsolete |
JJF 1184-2007
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Basic data | Standard ID | JJF 1184-2024 (JJF1184-2024) | | Description (Translated English) | Testing Specification for Temperature Uniformity in Thermocouple Calibration Furnaces | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 32,396 | | Date of Issue | 2024-02-07 | | Date of Implementation | 2024-08-07 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1184-2024: Testing Specification for Temperature Uniformity in Thermocouple Calibration Furnaces
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Technical Specifications of the People's Republic of China
Technical Specifications for Temperature Field Test of Thermocouple Calibration Furnace
Released on 2024-02-07
2024-08-07 Implementation
The State Administration for Market Regulation issued
Temperature field of thermocouple calibration furnace
Test Specifications
Replaces JJF 1184-2007
Responsible unit. National Temperature Measurement Technical Committee
Main drafting unit. Hubei Institute of Metrology and Testing Technology
Liaoning Institute of Metrology
Participating in the drafting. Beijing Kangster Instrument Technology Co., Ltd.
Taian Panran Measurement & Control Technology Co., Ltd.
Liaoyang Metrology Thermal Engineering Experimental Factory
This specification is entrusted to the National Temperature Metrology Technical Committee for interpretation
The main drafters of this specification are.
Li Hongwei (Hubei Institute of Metrology and Testing Technology)
Hou Sulan (Liaoning Institute of Metrology)
Deng Aihu (Hubei Institute of Metrology and Testing Technology)
Wang Hao (Liaoning Institute of Metrology)
Participating drafters.
Gao Hongjun (Beijing Conste Instrument Technology Co., Ltd.)
He Baojun (Taian Panran Measurement and Control Technology Co., Ltd.)
Guo Jianjun (Liaoyang Metrology Thermal Engineering Experimental Factory)
Table of contents
Introduction (II)
1 Scope(1)
2 References(1)
3 Terminology (1)
4 Overview(1)
5 Test conditions(2)
5.1 Environmental conditions(2)
5.2 Test standards and supporting equipment (2)
5.3 Positioning device (3)
6 Test items(3)
7 Test methods (4)
7.1 Preparation before testing (4)
7.2 Test temperature points (6)
7.3 Constant temperature waiting time (7)
7.4 Temperature field test (7)
8 Data Processing(9)
8.1 Axial temperature gradient (9)
8.2 Axial temperature difference (9)
8.3 Radial temperature difference (9)
9 Expression of test results (10)
10 Retest interval (10)
Appendix A Temperature distribution characteristics of the calibration furnace (11)
Appendix B Test Record Format (13)
Appendix C Test Report Page Reference Format (20)
Appendix D Example of uncertainty assessment of temperature field measurement in thermocouple calibration furnace (22)
Introduction
JJF 1001-2011 "General metrological terms and definitions", JJF 1059.1-2012 "Evaluation and
The format of the standard is based on JJF 1071-2010 "National
"Rules for Writing Metrology and Calibration Specifications".
This revision refers to JJG75-2022 "Standard Platinum-Rhodium 10-Platinum Thermocouple", JJG141-2013 "Working
Precious Metal Thermocouples", JJG167-1995 Standard Platinum-Rhodium 30-Platinum-Rhodium 6 Thermocouples", JJG668-1997 Working
Platinum-rhodium 10-platinum, platinum-rhodium 13-platinum short thermocouples", JJF 1007-2007 "Terms and definitions of temperature measurement",
JJF 1262-2010 "Armored Thermocouple Calibration Specification", JJF 1637-2017 "Cheap Metal Thermocouple Calibration Specification" and
JJF 1991-2022 "Calibration Specification for Short Low-cost Metal Thermocouples" is a revision of JJF 1184-2007.
Replaces JJF 1184-2007.Compared with JJF 1184-2007, in addition to editorial changes, the main changes are as follows.
--- Added the introduction;
---Added reference files;
--- Modified the definitions of the terms mobile couple and fixed couple;
--- Adjusted the technical index requirements of some supporting equipment;
---Added the schematic diagram of the location and installation of different types of thermocouple calibration furnaces;
---Added test temperature points;
--- The original test method was adjusted, the micro-difference method was deleted, and the cup-type and hole-type temperature-averaging blocks were added for metal couple testing.
Test methods for temperature fields of fixed furnaces, multi-stage temperature control test furnaces and low-cost metal couple test furnaces without temperature equalization blocks;
--- Adjusted the calculation formula of the temperature field of the thermocouple calibration furnace;
--- Adjusted the record table in the appendix;
--- Added an example of uncertainty assessment for radial temperature field measurement.
The previous versions of this specification are as follows.
---JJF 1184-2007.
Technical Specifications for Temperature Field Test of Thermocouple Calibration Furnace
1 Scope
This specification is applicable to the temperature field test of horizontal thermocouple calibration furnace within 300℃~1500℃.
Thermocouple verification/calibration of electrically controlled heating equipment that provides a uniform temperature field may be carried out in accordance with this specification.
2 References
This specification references the following documents.
JJG75-2022 Standard Platinum-Rhodium 10-Platinum Thermocouple
JJG141-2013 Working precious metal thermocouple
JJG167-1995 Standard Pt30-Pt6 Thermocouple
JJG668-1997 Platinum-rhodium 10-platinum, platinum-rhodium 13-platinum short thermocouples for working use
JJF 1262-2010 Armored Thermocouple Calibration Specification
JJF 1637-2017 Calibration Specification for Low-cost Metal Thermocouples
JJF 1991-2022 Calibration Specification for Short Low-cost Metal Thermocouples
For any referenced document with a date, only the version with the date is applicable to this specification; for any referenced document without a date,
The latest version (including all amendments) shall apply to this specification.
3 Terminology
The temperature distribution of the center axis of the furnace is tested. The axial temperature field is expressed by the axial temperature gradient or axial temperature difference.
The radial temperature distribution of the vertical section at the specified axial position of the furnace is measured by measuring the radial temperature of the circle with the specified diameter of the furnace.
The radial temperature field is expressed by the radial temperature difference.
3.3 Fixed thermocouple
A standard thermocouple fixed in a specified position and used to measure the temperature change of the calibration furnace.
3.4 movable thermocouple
A standard thermocouple that moves between specified positions and is used to measure the temperature distribution in a calibration furnace.
4 Overview
Thermocouple calibration furnace (hereinafter referred to as calibration furnace) is a kind of furnace that provides uniform and stable temperature for thermocouple calibration.
The electric controlled heating equipment of the field, its basic structure consists of high temperature resistant ceramic furnace tube, heating element, refractory insulation layer, shell, etc.
Some calibration furnaces are also equipped with temperature control couples, temperature control systems, etc. The typical structural diagram is shown in Figure 1.
See Appendix A for types and corresponding temperature distribution characteristics.
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